The specific properties applicable to the Check Box control are:

  • Tri-state: Set to True to give this check box a third state, “indeterminate”. This third state appears to the user as a solid rectangle inside the checkbox (  ). If set to False the check box will have only two states, on and off.
  • Check State: Use this to control the default state of the check box. The state can also be changed programmatically by your script.